most important for the regime creating a new cult of personalities around this man, kim jungkim jong un. about him, little is known. >> wime don't even know how olde is. north korea hasn't released his birthdate. we assume he's in his late 20s, but that's never been confirmed. >> he's believed to have studied in switzerland. we're not sure. >> what is known is he now commands the world's fourth largest army with 1.1 million soldiers and a nuclear arsenal with4t six bombs. though the population of 22 million act with blind devotion to their new leader, some people inside the country are beginning to show unprecedented dissent. >> we have an exodus of north koreans leaving the country. >> the new underground railroad is the network of safe houses and secret routes, helping north koreans get out. this is extremely dangerous among christian missionaries who work with the north koreans. >> inia a fox files exclusive, e tracked down one man who risked everything to escape with his family. how scared were you when you were crossing that border? >> i knew that in order to live, i had to cross t